382 W. C. M‘SINTOSH ON BRITISH ANNELIDA. 
in the shorter forms, in which it grooves the extremity. The ventral branch has a 
series of rather slender bristles with tapering tips. Superiorly the latter are alternate, 
with only a trace of the secondary process; and it is sometimes broken off, so that the tip 
appears simple—a condition, indeed, apparently normal in some. One of the superior 
attenuate forms is represented in Pl. LX VIII. fig. 3. The pectinate or spinous rows 
are rather prominent. One of the best-marked shorter forms, with a somewhat worn 
extremity, is given in Pl. LXVIII. fig. 14. Toward the inferior border the bristles 
again have attenuate tips, with a very slender secondary process; and in some the latter 
is absent. The ventral cirrus reaches beyond the base of the bristles, and has some- 
what slender clavate papille. ‘The remarkable condition of the dorsal cirri has been 
noticed by Prof. Lankester; once, indeed, I received from a correspondent detached 
specimens which were supposed to be “ parasites.” The structure of the scales is most 
elaborate. In Britain this species was first found by Prof. Lankester in the tubes of 
Terebella nebulosa, and afterwards by Mr. Cooper in the tubes of Chetopterus, and by 
myself frequently under stones at Herm. It appears to be figured by O. G. Costa in 
Tav. 2 of his ‘ Aunel. di Napoli,’ 1857. 
HARMOTHOH MACLEODI', n.s. Found between tide-marks, Lochmaddy, North Uist, 
Shetland, and in the stomach of the cod, St. Andrews. Body elongated, rather narrow, 
and with comparatively short bristles; segments thirty-five. Head elongated from 
before backward, and with distinct eyes similarly placed to those in H. zetlandica—two 
at the posterior border, and two at the side in front of the middle line, all being visible 
from the dorsum. Palpi similar, as also are the tentacle, antenna, and tentacular cirri, 
which have clavate papilla. The scales appear to amount to fourteen or fifteen pairs, 
are pale, semitranslucent, and with a very few short papille along the outer and pos- 
terior border. The scales are arranged like those in H. zetlandica, circular in front, 
and increasing in size to the last two pairs. The dorsal cirri scarcely extend beyond the 
bristles, are slender, tapered from base to apex, and furnished with sparsely distributed 
clavate papille, which leave the tip bare. The ventral cirrus has a large base and a 
few clavate papille. 
The bristles of the dorsal branch of the foot differ from those of H. zetlandica, since 
their spinous rows continue to the tip of the organ. ‘They are comparatively short, 
moderately robust, very slightly curved, and not much tapered toward the tip. The 
spinous rows are also very closely placed. One of the larger examples is sketched in 
Pl. LXIX. fig. 2. In the smaller forms next the body the spinous rows are somewhat 
wider. The ventral division has boldiy bifid bristles superiorly (Pl. LXIX. fig. 3), the 
whole tip being rather broad, and the spinous region short. The secondary process at 
the tip diminishes in length from the superior to the inferior series; thus in the latter 
* Named after Dr. Kenneth Macleod, of H.M. Indian Army, who aided me in dredging at Paible, North Uist, 
in 1865, 
